1604693538 has 64 divisors (see below), whose sum is σ = 4079370240. Its totient is φ = 458038800.

The previous prime is 1604693537. The next prime is 1604693543. The reversal of 1604693538 is 8353964061.

1604693538 is a `hidden beast` number, since 1 + 604 + 6 + 9 + 3 + 5 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1604693493 and 1604693502.

It is not an unprimeable number, because it can be changed into a prime (1604693537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 759103 + ... + 761213.

It is an arithmetic number, because the mean of its divisors is an integer number (63740160).

Almost surely, 2^1604693538 is an apocalyptic number.

1604693538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1604693538 is an abundant number, since it is smaller than the sum of its proper divisors (2474676702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1604693538 is a wasteful number, since it uses less digits than its factorization.

1604693538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4140 (or 4134 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 1604693538 is about 40058.6262620175. The cubic root of 1604693538 is about 1170.7496445017.

The spelling of 1604693538 in words is "one billion, six hundred four million, six hundred ninety-three thousand, five hundred thirty-eight".